Calculators & Converters20 indexed toolsClient-side first

Calculators & Converters tools

Everyday calculators for finance, health, dates, units, and quick conversions.

Percentage Calculator

Solve common percentage calculations instantly.

Estimate GPA from course grades and credit hours.

Calculate age precisely from a birth date with years, months, and days.

Measure the exact duration between two dates and times.

Estimate EMI payments, interest cost, and repayment totals.

Calculate body mass index from weight and height.

Convert between common units for length, weight, speed, and temperature.

Convert currencies with browser fetch plus resilient offline fallback rates.

Convert a date and time across common time zones.

Convert numbers to Roman numerals and Roman numerals back to numbers.

Calculate tip amount, total bill, and per-person split in one step.

Work out discount savings and final totals after percentage reductions.

Measure percentage increase or decrease between an original and a new value.

Calculate selling price and profit from cost and markup percentage.

Estimate gross margin percentage and profit from selling price and cost.

Estimate fuel needed and trip cost from distance, efficiency, and fuel price.

Estimate monthly electricity cost from wattage, daily runtime, and energy price.

Calculate pace per kilometer and average speed from distance and total time.

Estimate future value and earned interest with annual compound growth.

Calculate distance traveled from speed and travel time in hours and minutes.